In general, it's difficult/impossible to defend against DDOS attacks, even if it's "a specific file on a specific script being targetted". But that's not really a vulnerability, so there's nothing that can really be done about it.

There are a huge company rushing towards the website designing and devloping.but we have to choose one of the best company that gives satishfaction to our requirements also affordable prices.for that reason Alphaconfig Solution is the right path to go for.